Cascade delta-sigma modulator

Details Cascade delta-sigma modulator Cascade delta-sigma modulator

2005-10-11

2005-10-11

Williams, Howard L. (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

Reexamination Certificate

active

06954161

ABSTRACT:
A delta-sigma modulation quantization loop, comprising an integration circuit for integrating the difference between an analog input signal and a feedback reference voltage, a local quantizer for quantizing the output of the integration circuit into a digital signal, and a DA converter for generating the feedback reference voltage from the digital output of the local quantizer, is used as a single stage, and a plurality of the stages are cascade-connected. In the second-stage and subsequent modulation quantization loops, the difference signal between the input of the local quantizer of the previous stage and the output of the DA converter of the previous stage is used as an analog input signal. The feedback reference voltages of the respective delta-sigma modulation quantization loops are set individually so as to be higher than the specified maximum voltage of the analog input signal to limit the gains of the respective delta-sigma modulation quantization loops. Gain setting devices are provided in a noise reduction circuit to roughly compensate the gains limited in the respective delta-sigma modulation quantization loops.

REFERENCES:
patent: 4704600 (1987-11-01), Uchimura
patent: 4851841 (1989-07-01), Sooch
patent: 5061928 (1991-10-01), Karema et al.
patent: 5103229 (1992-04-01), Ribner
patent: 5298900 (1994-03-01), Mauthe et al.
patent: 5629701 (1997-05-01), Ritoniemi et al.
patent: 6795002 (2004-09-01), Gupta
patent: 61177818 (1986-08-01), None

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